Each expected frequency is the cell's row total times its column total, divided by the grand total.

Step 1 — Note the totals. Row totals: Male $= 50$, Female $= 50$. Column totals: Liked $= 50$, Disliked $= 50$. Grand total $N = 100$.

Step 2 — Apply $E_{ij} = R_i C_j / N$ to each cell.

Step 3 — Display the expected table.

Using the grand total in the numerator or a wrong total in the denominator (e.g. $R_i C_j$ divided by a row total instead of $N$) is a frequent slip — the denominator is always the grand total $N$. Forgetting the margin check means a wrong expected va …